Air-pump.



PATENTED MAY 5, 1908.

0. J. DARLING.

AIR PUMP.

APPLIOATION FILED APR. 8,19'

ORRIS I. DARLING, OF DETROIT, MICHIGAN.

AIR-PUMP.

Specification of Letters Patent.

' Patented May 5, 1908.

. Application fil ed April 8, 1907. Serial No. 367,133.

' b all whom it may concern:

Be it known that 1, Denis J. DARLING, a citizen of the United States, residing at Detroit, county of Wayne, State of Michigan,

have invented a certain new and useful Imroveinent in Air-Pumps, and declare the ollowing to be a full, clear, and exact description of the same, such as 'will enable others skilled in the art to which it' pertains to make and use the same, reference being had to the accompanying drawings, which 1 form a part of this s ecilicationl This invention re ates to air pumps and its object is to provide a pump that may be used either as a force pump or as a vacuum pump. Its novelty consists in the peculiar arrangement of parts hereinafter more fully described.

In the drawing 1 have shown the pump as.

adapted for use in clearingt he traps in waste pi es to sinks, etc., but the rinciples invo lved in the construction may e utilized in pumps adapted for use in other ways.

Figure 1 is a sectional elevation of a pum embodying my invention. Fig. 2 is a detail of the upper end of the hollow piston rod' showing the inlet thereinto closed. Fig. 3 is a detail showing the inlet in the hollow piston rod open. Fig. 4 is a detail of the piston showing the valve in the lower end of the piston rod. p

Similar letters refer to similar parts throughout the several views.

A indicates the cylinder of the uni B is the. cap on the upper ent of t e cylinder'.

b is the vent in the cap. The lower end of the cylinder is open and in this case is provided with a rubber cup shaped foot F adapted to closely fit over the openingto the waste pipe in sinks etc. However I do not wish to iinit myself to such use of the ump as it is evident that various uses could is made of it by arranging the lower or outlet end to suit the conditions.

,The piston P is double acting being packed with two cu leathers 12-1) to withstand pressure in boti directions. The cup 39 forces air out p of the cylinder on the downward stroke of the istoii and the cup p draws air into the cylinder onthe u ward stroke of the piston. The piston rod t is hollow and is provided with a valve V at or near its lower end the upper end is provided with a handle H and a cap 0. The cap O is provided with so arranged that w en the cap is screwed openings cc and a acking ring or washer w" down on the end of the piston rod the 0 enings 0-0 are below the end ofthe rod an air may not enter therethrough by reason of the packing ring to being held tightly against the end of the hollow rod R by the cap C as shown in Fig. 2. If used as a force pump, the cap. O is raised, as shown in Fig. '3, so that the openings cc are above the end of the rod. On the upward stroke of the piston P, the

cylinder will fill with air which asses throu h the openings-c into the rod through t e valve V, and into the cylinder A. The down ward stroke of the piston closes the valve V and forces the air out of the cylinder. On the upward stroke, the air that is above the piston escapes by way of the vent b in the can B.

if the ump is usedto produce a vacuum, the cap is screwed down on the rod thus closing the openin s cc, consequently no air may get below t e piston through the rod and the upward stroke thereof tends to produce a vacuum.

4 The valve'V I have shown as a ball resting, in the open position, on a pin or bar 1/ in the lower end of the piston rod, thus allowing the air to pass freely around it when used as a force pump and on the u ward stroke. On the downward stroke, t at is when forcing air out of the cylinder, the ball rests against the seat s and prevents escape of the air through the rod. Nevertheless it is to be understood that any form of valve suitable for the urpose may be used.

Having thus Eriefly described my invention, what I c'laim'is? v 1. In an air pump, a cylinder open at its lower end and provided with means to fit over an opening, a double actin piston, a hollow rod to said piston, a check valve in said rod, and means on the rod controlling cylinder, a hollow piston rod provided with a In testimony whereof, I sign this specificavalve near the end attached to the piston, tion in the presence of two witnesses. and a cap on the opposite end thereof pron n V vided with a paoklng ring and having an OhRlb D1 IN 5 opening therein below said ring whereby the f Witnesses:

inlet to said piston rod may be opened or j CHAS. E. YJJSNER,

closed, substantially as shown and described. j WILL J. Sunni-1y. 

